Add bench_playback, for quick profiling of SKR playback.

gyp/tools.gyp

Index: gyp/tools.gyp
diff --git a/gyp/tools.gyp b/gyp/tools.gyp
index 079fd4d7a4a200e2a452b892650d57b1caf5c02c..8bcebf54a6b3226eeb7f662206518e152f7f8ab9 100644
--- a/gyp/tools.gyp
+++ b/gyp/tools.gyp
@@ -16,6 +16,7 @@
         'bbh_shootout',
         'bench_pictures',
         'bench_record',
+        'bench_playback',
         'filter',
         'lua_app',
         'lua_pictures',
@@ -308,6 +309,24 @@
       ],
     },
     {
+      'target_name': 'bench_playback',
+      'type': 'executable',
+      'sources': [
+        '../tools/bench_playback.cpp',
+        '../tools/LazyDecodeBitmap.cpp',
+      ],
+      'include_dirs': [
+        '../src/core/',
+        '../src/images',
+        '../src/lazy',
+      ],
+      'dependencies': [
+        'flags.gyp:flags',
+        'skia_lib.gyp:skia_lib',
+        'record.gyp:*',
+      ],
+    },
+    {
       'target_name': 'picture_renderer',
       'type': 'static_library',
       'sources': [